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If we know one thing about the Armory’s horrifying vault monster, it’s that it’s definitely not like anything we’ve ever seen before on “The Vampire Diaries.”

Despite the many supernatural visitors to roll in and out of Mystic Falls, “The Vampire Diaries” has never strayed very far from the holy trinity of monsters in all seven seasons of its run. Besides the gang’s brief run-in with the occasional doppelganger or hunter, new supernaturals are almost always witches, werewolves or vampires (or a witch-werewolf-vampire hybrid of some sort).

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Whatever this new monster is though, it — or she — is definitely none of the above.

“It’s a new take on villains for us,” Julie Plec said at the San Diego Comic-Con panel. “It’s rooted back all the way to ancient times.”

So far, all we know about this new villain is that her name is Sybil (Nathalie Kelley), and she seems to erase any kind of conscience or humanity from humans and vampires alike. Plus, her victims have a tendency to get violent and string corpses up like piñatas.

Other than that, we’re drawing a huge blank, so it’s time to speculate on which ancient monster Sybil could possibly be.

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Ghoul

giphy 11 What kind of monster is Sybil in The Vampire Diaries Season 8?

What does Sybil need with strung-up corpses anyways? Is she perhaps munching on them? Stories about monsters who feast on human flesh are as old as time, and ghouls would certainly fit right into the vampire genre.

Siren

giphy5 What kind of monster is Sybil in The Vampire Diaries Season 8?

Have we seen this mysterious monster work her magic on a woman yet? As far as we can tell, only men have fallen prey to Sybil’s supernatural persuasion, and she certainly seemed able to impersonate other women’s voices well enough.

Fairy

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We’re not talking about the sparkly, winged creatures with wands here. Fairy myths were originally about ancient tricksters who were best known for kidnapping people and leaving no trace behind. Sybil certainly managed to disappear with Damon (Ian Somerhalder) and Enzo (Michael Malarkey) without leaving a trace.

The devil

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It doesn’t get much more ancient than the root of all evil. We kind of love the idea of the devil as a woman, and we can’t think of a better power for her to have than the ability to strip away any trace of humanity from a person.

“The Vampire Diaries” returns Oct. 21st at 8 p.m. ET/PT on The CW.